Should I be supplementing with trace elements?

Greetings,
I have a 65 gallon with a few fish and inverts along with mushroom coral and a large leather coral. Would like to add in some additional varieties in the future. For filtration I use a protein skimmer and phosphate reactor, along with having a bag of activated carbon. Because of the carbon should I be supplementing with trace elements? I do a 15% water change weekly. Thanks.

- pp
 
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